CN115324103A - Large-span assembly type underground station based on simply supported diaphragm wall and floor slab and construction method - Google Patents
Large-span assembly type underground station based on simply supported diaphragm wall and floor slab and construction method Download PDFInfo
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- CN115324103A CN115324103A CN202210882781.6A CN202210882781A CN115324103A CN 115324103 A CN115324103 A CN 115324103A CN 202210882781 A CN202210882781 A CN 202210882781A CN 115324103 A CN115324103 A CN 115324103A
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- 239000010410 layer Substances 0.000 description 41
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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Abstract
The invention discloses a large-span assembly type underground station based on simple ground connection walls and floor slabs and a construction method thereof, wherein the large-span assembly type underground station comprises the ground connection walls, a bottom plate, a first support, a second hollow support, a third hollow support, a waist beam, a prefabricated top plate, a prefabricated middle plate and a prefabricated wall plate; the first support is fixedly connected with the upper ends of the ground connecting walls on the two sides; two ends of the second hollow support are respectively placed on the shelves and fixed on the notches at two sides of the ground connecting wall; the waist beam is fixed on the ground connecting wall, and the third hollow supporting shelf is fixed on the waist beams at two sides; prefabricating a middle plate shelf and fixing the middle plate shelf on a third hollow support, prefabricating a top plate shelf and fixing the top plate shelf on a second hollow support; the prefabricated wall board and the diaphragm wall are poured and fixed, part of the second hollow supports and the third hollow supports are installed in the foundation pit excavation stage and are mutually spaced, and part of the second hollow supports and the third hollow supports are installed behind the prefabricated middle plate and the prefabricated wall board. The station has a transparent view, the prefabricated parts are convenient to hoist during construction, and the requirement on installation precision is low.
Description
Technical Field
The invention belongs to the technical field of underground stations, and particularly relates to a large-span fabricated underground station based on simple underground diaphragm walls and floor slabs and a construction method.
Background
The enclosure structure of the station with the fully-prefabricated assembly structure adopts anchor cables and enclosure piles, the main body adopts prefabricated assembly components similar to pipe pieces, the prefabricated assembly components are connected through tenons and steel bolts, and construction is carried out by adopting specially-manufactured large-scale installation equipment for assembly. However, the anchor cable and the fender pile are only suitable for places without underground structures and without soft soil layers and sand layers in the geology, and the anchor cable and the fender pile are not suitable for places in urban areas and water-rich strata with high underground space development degree. If the building envelope is changed into support + diaphragm wall, the support can block the hanging down and assembly of the member. And the total prefabricated part has larger and irregular weight, has higher requirements on production, transportation and hoisting, and is easily limited by construction conditions.
If an assembly type station is adopted, the system can be used for supporting a foundation pit of a retaining wall, the node is a fixed support node based on an equivalent cast-in-place theory, reinforcing steel bars are dense and complex, and the position of the reinforcing steel bars is inconvenient to adjust by prefabricated parts, so that the node precision requirement is extremely high, and the node construction efficiency is greatly reduced.
In addition, the conventional subway station is an underground multi-layer multi-span structure, the span is generally about 10m, and a structural system of beams and columns is longitudinally arranged, however, the space of a station hall layer is reduced, and the visual permeability is reduced.
Disclosure of Invention
The invention provides a large-span assembly type underground station based on simple underground diaphragm walls and floor slabs and a construction method, and aims to solve the problems that prefabricated parts are greatly limited by construction conditions, the installation precision of nodes is high, and the visual field permeability of the station is poor in the prior art.
The invention adopts the following technical scheme:
a large-span fabricated underground station based on simple underground diaphragm walls and floor slabs comprises the underground diaphragm walls, a bottom plate, a first support, a second hollow support, a third hollow support, a waist beam, a prefabricated top plate, a prefabricated middle plate and a wall cast-in-place layer;
two ends of the first support are respectively connected and fixed with the upper ends of the ground connection walls on two sides; a notch is formed in the inner side of the upper part of the underground diaphragm wall below the first support, and two ends of the second hollow supports are respectively arranged on the rack and fixed on the notches at two sides; the waist beams are fixed on the ground connection wall, and two ends of the third hollow supports are respectively provided with a shelf and fixed on the waist beams at two sides;
the bottom plate is connected and fixed with the lower end of the underground diaphragm wall, the prefabricated middle plate shelf is fixed on the third hollow support, and the prefabricated top plate shelf is fixed on the second hollow support; the wall cast-in-place layer and the diaphragm wall are poured and fixed to form a superposed wall;
part of the third hollow supports are arranged at the excavation stage of a foundation pit and are spaced from each other, and part of the third hollow supports are arranged behind the wall cast-in-place layer; and part of the second hollow supports are arranged at the excavation stage of a foundation pit and are spaced from each other, and part of the second hollow supports are arranged behind the prefabricated middle plate.
In some embodiments, the second hollow support and/or the third hollow support is a hollow prestressed beam.
In some embodiments, the second hollow support and/or the third hollow support are arranged densely.
In some embodiments, a detachable L-shaped plate corresponding to the second hollow supporting position is embedded at the upper end of the ground connecting wall, so that the notch is formed after the L-shaped plate is detached.
In some embodiments, the wale includes a prefabricated part and a cast-in-place part, and the prefabricated part is connected with the tie bar of the diaphragm wall and fixed by the cast-in-place part.
In some embodiments, the prefabricated part is L-shaped in cross section, and the cast-in-place part is positioned between the prefabricated part and the diaphragm wall.
In some embodiments, the wale and the third hollow support are positioned by a latch.
In some embodiments, the composite wall further comprises a prefabricated wall panel, wherein the prefabricated wall panel is connected with the underground diaphragm wall tie bars with a gap therebetween, and the prefabricated wall panel and the underground diaphragm wall are fixed to form the laminated wall by pouring and forming the wall cast-in-place layer in the gap.
In some embodiments, the bottom plate is connected with the diaphragm wall tie bar and is poured and fixed.
A construction method of a large-span assembled underground station based on simple support of diaphragm walls and floor slabs comprises the following steps:
s1, constructing a diaphragm wall, and forming a gap at the upper end of the diaphragm wall;
s2, erecting hoisting equipment;
s3, excavating a foundation pit, and sequentially supporting by adopting a first support, a second hollow support and a third hollow support from top to bottom in the excavation process, wherein the second hollow support and the third hollow support are arranged at intervals when being installed; the second hollow supporting shelf is fixed on the notch, the third hollow supporting shelf is arranged on the waist beam, and the waist beam is fixed on the ground coupling wall;
s4, excavating the foundation pit to the position of the base, constructing a bottom plate, and fixing the bottom plate and the underground diaphragm wall;
s5, hoisting materials to the negative two layers through respective intervals of the second hollow support and the third hollow support, taking the diaphragm wall as an outer layer, and forming a superposed wall with the negative two layers by a construction wall cast-in-place layer;
s6, hoisting part of the third hollow supports at intervals through the second hollow supports to finish the dense paving of the third hollow supports, hoisting the prefabricated middle plate rack on the third hollow supports, and pouring to form a laminated middle plate;
s7, hoisting the material to a negative layer through the second hollow support at intervals, taking the diaphragm wall as an outer layer, and forming a negative-layer laminated wall by the cast-in-place construction wall;
s8, hoisting part of the second prefabricated support to the gap to finish the close laying of the second hollow support;
s9, hoisting the prefabricated top plate on the second hollow support and pouring and fixing;
and S10, backfilling the attached soil above the prefabricated top plate.
Compared with the prior art, the invention has the beneficial effects that:
1. in the large-span assembled underground station based on the simple support of the diaphragm wall and the floor slab, the second hollow support and the third hollow support are adopted, so that the effect of supporting a foundation pit is achieved in the foundation pit excavation stage, the second hollow support and the third hollow support are used as a support structure of a middle plate and a top plate in a main body structure of the station, and meanwhile, as the second hollow support and the third hollow support are both hollow, the large-span station can meet the requirement of the large-span station, a column structure is not required to be arranged, and the sight of the station is better; the station is arranged without a column, the span of the top plate and the middle plate can exceed 20m (the span of the conventional vehicle station with the column is 10 m), and the requirement of large span without the column is realized.
2. The foundation pit is supported by adopting the mode of the diaphragm wall and the support, and the third hollow support and the second hollow support are arranged at intervals in the excavation stage of the foundation pit, so that the prefabricated part can be hoisted in the later construction of the main body of the station through the intervals, and the use of the prefabricated part is not influenced;
3. the third hollow support and the second hollow support form a simple support structure in a shelf fixing mode, and a local simple support laying connection scheme is adopted, so that the construction error adaptability can be improved, the construction difficulty is reduced, and the construction efficiency is improved; meanwhile, the whole structure is still a statically indeterminate structure, is safe and reliable, and meets the requirements of normal application and earthquake resistance;
4. the superposed wall of the main structure of the station is formed by fixing the diaphragm wall and the cast-in-place wall layer, is suitable for the conditions of poor stratum condition, large burial depth and large floor height, has better waterproof effect and quality, and meets the requirements of operation acceptance and use;
5. the invention adopts the technology that the support also serves as the main body of the station, can avoid the influence of the support on the installation of the components of the assembly station, reduces the procedures of the conventional support breaking and template erection of the station, can effectively improve the efficiency of the station construction, has higher assembly rate and meets the requirements of the assembly type building.
Drawings
The technology of the present invention is described in further detail below with reference to the accompanying drawings and the detailed description:
FIG. 1 is a cross-sectional view of a large span fabricated underground station based on simple support of diaphragm wall and floor slab according to the present invention;
FIG. 2 is a schematic longitudinal sectional view of a large-span fabricated underground station based on simple ground connection walls and floor slabs according to the present invention;
FIG. 3 is a schematic cross-sectional view of a second hollow brace of the present invention being hoisted during the excavation stage of a foundation pit;
FIG. 4 is a schematic longitudinal cross-sectional view of a second hollow brace of the present invention being hoisted during the excavation stage of a foundation pit;
FIG. 5 is a schematic structural view of a second hollow support;
FIG. 6 is a schematic cross-sectional view of a third hollow brace of the present invention being hoisted during the excavation stage of a foundation pit;
FIG. 7 is a schematic longitudinal cross-sectional view of a third hollow brace of the present invention being hoisted during the excavation stage of a foundation pit;
FIG. 8 is a schematic structural view of a third hollow support;
FIG. 9 is a schematic view of the wale in connection with the diaphragm wall;
FIG. 10 is a cross-sectional schematic view of the invention after bottom completion;
FIG. 11 is a schematic longitudinal cross-sectional view of the invention after completion of the bottom thereof;
FIG. 12 is a schematic view of prefabricated wall panels connected to a diaphragm wall to form a laminated wall;
fig. 13 is a schematic cross-sectional view of a third hollow support of the present invention being hoisted at a stage of construction of a main structure of a station;
fig. 14 is a schematic longitudinal sectional view of the third hollow support of the present invention when it is hoisted at the stage of construction of the main structure of the station.
Reference numerals:
1-underground diaphragm wall; 11-a notch; 2-a bottom plate; 3-a first support; 4-a second hollow support; 5-a third hollow support; 6-waist rail; 61-a prefabricated part; 62-a cast-in-place part; 7-prefabricating a top plate; 8-prefabricating a middle plate; 9-prefabricating a wallboard; 91-wall cast-in-place layer; and 10-hoisting equipment.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.
Referring to fig. 1 to 14, a large-span fabricated underground station based on simple ground connection walls and floor slabs comprises a ground connection wall 1, a bottom plate 2, a first support 3, a second hollow support 4, a third hollow support 5, a wale 6, a prefabricated top plate 7, a prefabricated middle plate 8 and a wall cast-in-place layer 91.
Referring to fig. 1 to 4, two ends of the first support 3 are respectively connected and fixed to the upper ends of the ground connection walls 1 on two sides. The first support 3 is used as a first support of the underground diaphragm wall 1, can adopt a precast beam or a cast-in-place beam, and is connected with the underground diaphragm wall 1 through a crown beam. When the installation reagent of the first support 3 is used for foundation pit excavation, the installation and fixation are started when the reagent is dug to the bottom surface of the first support 3 with the designed height.
Referring to fig. 1 to 5, a gap 11 is formed in the inner side of the upper portion of the diaphragm wall 1 below the first support 3, and two ends of the second hollow supports 4 are respectively placed on the gap 11 and fixed to the two sides. The second hollow support 4 can adopt a prefabricated box girder which is of a hollow structure and is light in weight, so that the large-span use can be realized. Because second cavity supports 4 and adopts the mode of shelf on breach 11 to fix, under this kind of mode, when need not to carry out the nodal connection of these two components, need not to carry out node reinforcement engineering time, improve construction error adaptability, reduce the construction degree of difficulty, node construction convenience for support implementation efficiency, simultaneously, this kind of structure still is hyperstatic structure, and safe and reliable satisfies normal suitable and antidetonation requirement. It should be noted that, part of the second hollow supports 4 are installed at the excavation stage of the foundation pit and spaced from each other, so as to avoid that the second hollow supports 4 which are too dense may obstruct the hoisting of other prefabricated components at the construction stage of the station main body, wherein the second hollow supports and the third hollow supports installed at the excavation stage of the foundation pit are in one-to-one correspondence from top to bottom. And after the rest part of the second hollow supports 4 are arranged on the prefabricated middle plate 8, namely after the hoisting and installation of the lower prefabricated part are finished, other second hollow supports 4 are supplemented, and the second hollow supports 4 are densely arranged.
Referring to fig. 1, 2, 6 to 9, the wale 6 is fixed to the diaphragm wall 1, specifically, connected by a steel bar sleeve reserved on the diaphragm wall 1 and then poured and fixed. The two ends of the third hollow supports 5 are respectively arranged on the shelves and fixed on the waist beams 6 at the two sides, and similarly, the third hollow supports 5 can adopt prefabricated box beams which are of hollow structures and light in weight, so that the large-span use can be realized. Because the third cavity supports 5 and adopts the mode of shelf on wale 6 to fix, under this kind of mode, when need not to carry out the nodal connection of these two components, need not to carry out node reinforcement engineering time, improve construction error adaptability, reduce the construction degree of difficulty, node construction convenience for support implementation efficiency, simultaneously, this kind of structure still is hyperstatic structure, and safe and reliable satisfies normal suitable and antidetonation requirement. It should be noted that part of the third hollow supports 5 are installed at the excavation stage of the foundation pit and are spaced from each other, so as to avoid that the third hollow supports 5 which are too dense hinder hoisting of other prefabricated components at the construction stage of the station main body; after a part of the third hollow supports 5 are installed on the wall cast-in-place layer 91, that is, after the construction of the wall cast-in-place layer 91 below is completed, the other third hollow supports 5 are supplemented, and the third hollow supports 5 are densely arranged.
In one embodiment, referring to fig. 1, 2, 10 and 11, the bottom plate 2 is connected and fixed to the lower end of the diaphragm wall 1, and in particular, the bottom plate 2 is connected and cast and fixed to the tie bars of the diaphragm wall 1. The prefabricated middle plate 8 is arranged on and fixed on the third hollow support 5, and the prefabricated top plate 7 is arranged on and fixed on the second hollow support 4; and the wall cast-in-place layer 91 and the underground diaphragm wall 1 are poured and fixed to form a superposed wall. The side wall of station main part is the coincide wall, adopts cast-in-place layer 91 of wall and ground to link wall 1 and forms, possesses the coincide wall characteristics. That is, in this embodiment, the laminated wall has a two-layer structure, namely, the diaphragm wall 1 and the wall cast-in-place layer 91.
In another embodiment, the prefabricated wall panel 9 is further included, the prefabricated wall panel 9 is connected with the tie bars of the diaphragm wall 1, and a gap is formed between the prefabricated wall panel 9 and the tie bars, at this time, the prefabricated wall panel 9 can also be connected with upper and lower floor slabs through ring bar buckling mutual anchoring nodes, concrete is poured in the gap to form the wall cast-in-place layer 91, and the prefabricated wall panel 9 and the diaphragm wall 1 are fixed to form the laminated wall. The superposed wall fully utilizes the underground diaphragm wall 1 in the permanent use stage (namely, the station main body), and can adjust the total thickness of the superposed layer and the wall body according to calculation, thereby having better applicability to different stratums, burial depths and floor heights; compared with a single wall scheme, the waterproof wall has better waterproof effect and quality, and can meet the operation acceptance and use requirements. That is, in this embodiment, the laminated wall has three layers, namely, the diaphragm wall 1, the wall cast-in-place layer 91 and the prefabricated wall panel 9.
In the invention, the first support 3, the second hollow support 4, the third hollow support 5 and the underground diaphragm wall 1 are used as an enclosure structure of a foundation pit in the construction stage of the foundation pit, and the structures are used as a frame beam and a superposed wall of a station main body, so that the concrete consumption of the side wall and the frame beam of the main body structure is reduced.
In order to bear the constant load of the upper part of the top plate, which is more than the load of the covering soil, the conventional cast-in-place structure needs to be made into a large and heavy thick plate structure. The invention adopts a prestress system, can effectively reduce the section size of the member and the weight of the prefabricated member, and can reduce the construction cost and the construction difficulty. In particular, the second hollow branch is a hollow prestressed girder, such as a prestressed box girder. Similarly, to support the structure and traffic above the midplane, and to reduce the weight of the structure associated with the midplane, the third hollow leg is a hollow pre-stressed beam, such as a pre-stressed box beam.
Preferably, with reference to fig. 1 and 2, said second hollow support 4 and/or said third hollow support 5 are arranged densely. In the stage of foundation pit construction, the second hollow supports 4 and/or the third hollow supports 5 are arranged at intervals, and in the stage of construction of the station main body, after the second hollow supports 4 and/or the third hollow supports 5 are installed, the second hollow supports 4 and/or the third hollow supports 5 are densely paved, so that the supporting capacity for the upper part is further improved.
Referring to fig. 1 and 3, a detachable L-shaped plate corresponding to the second hollow support 4 is embedded in the upper end of the ground connecting wall 1, so as to form the notch 11 after the L-shaped plate is detached, that is, the notch 11 is step-shaped, the end of the second hollow support 4 can be directly erected on the notch 11, and after the notch is erected, high-strength mortar is filled into the gap to fix the ground connecting wall 1 and the second hollow support 4. The L template is the steel sheet, is about to L template pre-buried in the upper end of even wall 1 even in the ground in the preparation stage of even wall 1, after the foundation ditch excavation in the position of this L template, can demolish the L template to form this breach 11, support 4 with shelf second cavity.
Referring to fig. 9, the wale 6 includes a prefabricated part 61 and a cast-in-place part 62, and the prefabricated part 61 is connected with the tie bars of the diaphragm wall 1 and fixed by the cast-in-place part 62. The underground diaphragm wall 1 is reserved with a steel bar sleeve so as to be connected with the wale 6 through a lacing wire, and after connection, the prefabricated part 61 and the underground diaphragm wall 1 are connected and fixed in a cast-in-place mode. Specifically, the cross section of the prefabricated part 61 is in an L shape, the cast-in-place part 62 is located between the prefabricated part 61 and the underground diaphragm wall 1, the lower end of the L shape is connected with a tie bar of the underground diaphragm wall 1, a groove with an upward opening is formed between the prefabricated part and the underground diaphragm wall 1, and the cast-in-place part 62 is formed by pouring in the groove.
In order to position the wale 6 and the third hollow support 5, the wale 6 and the third hollow support 5 are positioned by means of a bolt, namely, a hole and a pin between the wale 6 and the third hollow support 5, so that the third hollow support 5 can be prevented from being deviated after the shelf. It will be appreciated that one of the wale 6 and the third hollow support 5 is pre-provided with holes and the other with pegs.
Referring to fig. 1 to 14, a construction method of a large span assembly type underground station based on simple support of diaphragm walls and floor slabs includes the following steps:
s1, constructing a ground connection wall 1, and forming a notch 11 at the upper end of the ground connection wall 1. The gap 11 is formed by pre-embedding an L-shaped steel plate in the construction process of the diaphragm wall 1 and then removing the steel plate, and is used for carrying out shelf support on the second hollow support 4 in the following construction engineering; the underground diaphragm wall 1 is used as a part of a side wall of the station main body in the future and is surrounded on four sides. And simultaneously constructing the uplift pile for connecting and fixing with the bottom plate in the follow-up process.
S2, erecting hoisting equipment 10, and erecting a track and a gantry crane on the foundation pit crown beam or foundation pit side ground beam basis for hoisting components, hoisting materials or unearthing.
S3, excavating a foundation pit, and sequentially supporting by using a first support 3, a second hollow support 4 and a third hollow support 5 from top to bottom in the excavation process, wherein the second hollow support 4 and the third hollow support 5 are arranged at intervals when being installed; wherein, the second hollow support 4 is arranged on the notch 11, the third hollow support 5 is arranged on the waist beam 6, and the waist beam 6 is fixed on the ground wall 1. The method specifically comprises the following steps:
s31, firstly digging a foundation pit to the bottom of the first support 3, constructing and installing the first support 3, pouring and fixing the two ends of the first support 3 and the ground connection walls 1 on the two sides, for example, hoisting the first support 3, and pouring a crown beam to connect the first support 3 and the ground connection walls 1 together.
And S32, continuing excavating the foundation pit, referring to fig. 3 and 4, excavating the foundation pit to the bottom of the second hollow support 4, hoisting the second hollow support 4 to the gap 11, grouting in the gap for fixing, using the prestressed box girder as the second hollow support 4, and pouring non-shrinkage high-strength cement slurry into the gap to enable the support to transfer force to the diaphragm wall 1. The second hollow supports 4 to be hoisted at this time are not installed all the second hollow supports 4, but only installed in part, and the second hollow supports 4 are spaced from each other when installed, so as to leave a space for subsequent hoisting.
And S33, continuing downward excavation, namely excavating a foundation pit to the bottom of the third hollow support 5, and connecting the prefabricated part 61 of the hoisting waist beam 6 with the underground diaphragm wall 1 and pouring the cast-in-place part 62 to form the complete waist beam 6 by referring to fig. 6 and 7. And hoisting the third hollow support 5 to be placed on the waist beam 6, connecting and positioning the third hollow support 5 and the waist beam 6 by adopting a bolt pin mode, grouting and fixing in the gap, wherein the prestressed box beam is used as the third hollow support 5, and non-shrinkage high-strength cement paste is poured into the gap to ensure that the support transfers force to the diaphragm wall 1. The third hollow supports 5 to be hoisted at this time do not have all the third hollow supports 5 installed, but only have a part installed, and the third hollow supports 5 are spaced from each other when being installed, so as to leave a space for subsequent hoisting.
S4, referring to fig. 10 and 11, excavating a foundation pit to the position of the substrate, constructing a cushion layer and a waterproof layer, pouring a bottom plate 2, embedding a steel bar sleeve in the position of the bottom plate 2 of the underground diaphragm wall 1, connecting steel bars, and fixing the bottom plate 2 and the underground diaphragm wall 1.
S5, referring to FIG. 12, hoisting materials and prefabricated wall boards 9 to a negative second layer through respective intervals of the second hollow support 4 and the third hollow support 5, and constructing a wall cast-in-place layer 91 to form a superposed wall with the negative second layer by taking the diaphragm wall 1 as an outer layer, or constructing the wall cast-in-place layer 91 and installing the prefabricated wall boards 9 to form a superposed wall with the negative second layer; the shear resistant ribs are connected to the diaphragm wall 1 and are vertically connected with the prefabricated wall board 9, and then a concrete structure is poured between the gap between the diaphragm wall 1 and the prefabricated wall board 9 to connect the diaphragm wall 1 and the prefabricated wall board 9 together. Wherein, prefabricated wallboard 9 is truss single face wall prefabricated component.
S6, referring to fig. 13 and 14, closely laying the third hollow supports 5 by hoisting part of the third hollow supports 5 at intervals of the second hollow supports 4, hoisting the prefabricated middle plate 8 to be placed on the third hollow supports 5, and pouring to form a laminated middle plate. In the step, vertical walls extending downwards can be arranged below the prefabricated middle plates 8 on two sides of the station to form side walls of the rail top air duct, and the prefabricated air duct bottom plates 2 can be placed in the later period.
S7, referring to FIG. 12, constructing a wall cast-in-place layer 91 to form a negative-layer laminated wall by taking the diaphragm wall 1 as an outer layer through the interval hoisting materials of the second hollow supports 4 and the prefabricated wall boards 9, or constructing the wall cast-in-place layer 91 and installing the prefabricated wall boards 9 to form the negative-layer laminated wall; this step may refer to step S5.
S8, hoisting part of the second prefabricated support to the gap 11 to finish the close laying of the second hollow support 4. The rest prefabricated box girders are hoisted at intervals far away from the second prefabricated supports to be filled, the two ends of each prefabricated box girder are placed on the notches 11, and non-shrinkage high-strength cement slurry is poured into the butt joints.
S9, hoisting the prefabricated top plate 7 on the second hollow support 4 and pouring and fixing to form a superposed top plate, and implementing a waterproof and waterproof protective layer on the superposed top plate;
and S10, referring to the figures 1 and 2, backfilling the attached soil above the superposed top plate by other internal structures (prefabricated structures) such as the installation bedplate and the like, and completing the construction of the station.
Other contents of the large-span fabricated underground station based on the simple underground diaphragm wall and the floor slab and the construction method are referred to in the prior art and are not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A large-span fabricated underground station based on simple underground diaphragm walls and floor slabs is characterized by comprising the underground diaphragm walls, a bottom plate, a first support, a second hollow support, a third hollow support, a waist beam, a prefabricated top plate, a prefabricated middle plate and a wall cast-in-place layer;
two ends of the first support are respectively connected and fixed with the upper ends of the ground connecting walls on two sides; the upper part of the underground diaphragm wall is provided with a notch at the inner side below the first support, and two ends of the second hollow supports are respectively provided with a shelf and fixed on the notches at two sides; the waist beams are fixed on the ground connecting wall, and two ends of the third hollow supports are respectively placed on the waist beams at two sides and fixed on the waist beams at two sides;
the bottom plate is connected and fixed with the lower end of the underground diaphragm wall, the prefabricated middle plate shelf is fixed on the third hollow support, and the prefabricated top plate shelf is fixed on the second hollow support; the wall cast-in-place layer and the diaphragm wall are poured and fixed to form a superposed wall;
part of the third hollow supports are arranged at the excavation stage of a foundation pit and are spaced from each other, and part of the third hollow supports are arranged behind the wall cast-in-place layer; and part of the second hollow supports are arranged at the excavation stage of a foundation pit and are spaced from each other, and part of the second hollow supports are arranged behind the prefabricated middle plate.
2. The ground connection wall and floor simple-supported long-span fabricated underground station as claimed in claim 1, wherein the second hollow support and/or the third hollow support is a hollow prestressed girder.
3. The large-span fabricated underground station based on simple underground diaphragm wall and floor slab of claim 1, wherein the second hollow support and/or the third hollow support are closely laid.
4. The large-span fabricated underground station based on simple underground diaphragm wall and floor slab as claimed in claim 1, wherein the upper end of the underground diaphragm wall is pre-embedded with a removable L-shaped plate corresponding to the second hollow supporting position, so as to form the gap after the L-shaped plate is removed.
5. The short span assembly type underground station based on the diaphragm wall and the floor slab as claimed in claim 1, wherein the wale includes a prefabricated part and a cast-in-place part, and the prefabricated part is connected with the diaphragm wall lacing wire and fixed by the cast-in-place part.
6. The large-span fabricated underground station based on simple underground diaphragm walls and floor slabs as claimed in claim 5, wherein the prefabricated part has an L-shaped cross section, and the cast-in-place part is located between the prefabricated part and the underground diaphragm wall.
7. The large-span fabricated underground station based on simple underground diaphragm wall and floor slab of claim 5, wherein the wale and the third hollow support are positioned by a bolt.
8. The large-span fabricated underground station based on simple underground diaphragm walls and floor slabs as claimed in claim 1, further comprising prefabricated wall panels, wherein the prefabricated wall panels are connected with the underground diaphragm wall tie bars with gaps therebetween, and the prefabricated wall panels and the underground diaphragm wall are fixed to form the laminated wall by casting the wall cast-in-place layer in the gaps.
9. The large-span fabricated underground station based on simple underground diaphragm wall and floor slab as claimed in claim 1, wherein the bottom plate is connected with the tie bars of underground diaphragm wall and fixed by pouring.
10. A construction method of a large-span assembled underground station based on simple support of diaphragm walls and floor slabs is characterized by comprising the following steps:
s1, constructing a diaphragm wall, and forming a gap at the upper end of the diaphragm wall;
s2, erecting hoisting equipment;
s3, excavating a foundation pit, and sequentially supporting by adopting a first support, a second hollow support and a third hollow support from top to bottom in the excavation process, wherein the second hollow support and the third hollow support are arranged at intervals when being installed; the second hollow support shelf is fixed on the notch, the third hollow support shelf is arranged on the waist beam, and the waist beam is fixed on the ground connecting wall;
s4, excavating the foundation pit to the position of the base, constructing a bottom plate, and fixing the bottom plate and the underground diaphragm wall;
s5, hoisting materials to the negative two layers through respective intervals of the second hollow support and the third hollow support, taking the diaphragm wall as an outer layer, and forming a superposed wall with the negative two layers by a construction wall cast-in-place layer;
s6, hoisting part of the third hollow supports at intervals through the second hollow supports to finish the close laying of the third hollow supports, hoisting the prefabricated middle plate to be placed on the third hollow supports, and pouring to form a laminated middle plate;
s7, hoisting the material to a negative layer through the second hollow support at intervals, taking the diaphragm wall as an outer layer, and forming a negative-layer laminated wall by the cast-in-place construction wall;
s8, hoisting part of the second prefabricated support to the gap to finish the close laying of the second hollow support;
s9, hoisting the prefabricated top plate on the second hollow support and pouring and fixing;
and S10, backfilling the attached soil above the prefabricated top plate.
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| CN202210882781.6A CN115324103B (en) | 2022-07-26 | 2022-07-26 | Large-span assembled underground station based on simply supported diaphragm wall and floor slab and construction method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152761A (en) * | 1997-11-19 | 1999-06-08 | Kajima Corp | Underground structure and construction method thereof |
| CN205839740U (en) * | 2016-07-20 | 2016-12-28 | 温州市铁路与轨道交通投资集团有限公司 | The building enclosure that a kind of vertical cross section-variable underground continuous wall is combined with agent structure |
| CN206784393U (en) * | 2017-04-22 | 2017-12-22 | 南京鼎卓岩土技术有限公司 | T-piece and underground pipe gallery foundation pit support system |
| CN207160062U (en) * | 2017-08-08 | 2018-03-30 | 广州地铁设计研究院有限公司 | A kind of underground is without post overlapping wall station |
| CN109707051A (en) * | 2019-01-04 | 2019-05-03 | 国住人居工程顾问有限公司 | Wall/column and beam slab connection structure and construction method |
| CN112031026A (en) * | 2020-09-29 | 2020-12-04 | 广州地铁集团有限公司 | Permanent-temporary combined open-cut and smooth-built structure for subway station and construction method |
| CN216108526U (en) * | 2021-09-13 | 2022-03-22 | 长江勘测规划设计研究有限责任公司 | Underground continuous wall structure for foundation pit support |
| CN216552071U (en) * | 2021-12-14 | 2022-05-17 | 重庆市轨道交通设计研究院有限责任公司 | Rectangular column-free underground station section and assembled underground station |
-
2022
- 2022-07-26 CN CN202210882781.6A patent/CN115324103B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152761A (en) * | 1997-11-19 | 1999-06-08 | Kajima Corp | Underground structure and construction method thereof |
| CN205839740U (en) * | 2016-07-20 | 2016-12-28 | 温州市铁路与轨道交通投资集团有限公司 | The building enclosure that a kind of vertical cross section-variable underground continuous wall is combined with agent structure |
| CN206784393U (en) * | 2017-04-22 | 2017-12-22 | 南京鼎卓岩土技术有限公司 | T-piece and underground pipe gallery foundation pit support system |
| CN207160062U (en) * | 2017-08-08 | 2018-03-30 | 广州地铁设计研究院有限公司 | A kind of underground is without post overlapping wall station |
| CN109707051A (en) * | 2019-01-04 | 2019-05-03 | 国住人居工程顾问有限公司 | Wall/column and beam slab connection structure and construction method |
| CN112031026A (en) * | 2020-09-29 | 2020-12-04 | 广州地铁集团有限公司 | Permanent-temporary combined open-cut and smooth-built structure for subway station and construction method |
| CN216108526U (en) * | 2021-09-13 | 2022-03-22 | 长江勘测规划设计研究有限责任公司 | Underground continuous wall structure for foundation pit support |
| CN216552071U (en) * | 2021-12-14 | 2022-05-17 | 重庆市轨道交通设计研究院有限责任公司 | Rectangular column-free underground station section and assembled underground station |
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| CN115324103B (en) | 2023-11-24 |
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